<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
	</head>
	<style>
	  div{
	    width: 200px;
	    height: 100px;
	    margin: 200px auto;
	    background: #ccc;
	    box-shadow: 2px 5px 3px 1px #333;
	    text-align: center;
	    line-height: 100px;
	    font-size: 30px;
	    cursor: pointer;
	  }
	  div:active{
	    box-shadow: inset 2px 2px 3px 1px #333;
	  }
	  /*
	   box-shadow(x,y,模糊,扩展范围) 
	   * */
	</style>
	<body>
	  <div>按钮</div>
	</body>
</html>
